CN117447859A - Surface treatment method of water-based paint titanium white - Google Patents
Surface treatment method of water-based paint titanium white Download PDFInfo
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- CN117447859A CN117447859A CN202311413932.4A CN202311413932A CN117447859A CN 117447859 A CN117447859 A CN 117447859A CN 202311413932 A CN202311413932 A CN 202311413932A CN 117447859 A CN117447859 A CN 117447859A
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- titanium dioxide
- water
- titanium white
- based paint
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- GWEVSGVZZGPLCZ-UHFFFAOYSA-N Titan oxide Chemical compound O=[Ti]=O GWEVSGVZZGPLCZ-UHFFFAOYSA-N 0.000 title claims abstract description 125
- 235000010215 titanium dioxide Nutrition 0.000 title claims abstract description 79
- 239000003973 paint Substances 0.000 title claims abstract description 41
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 title claims abstract description 37
- 238000000034 method Methods 0.000 title claims abstract description 24
- 238000004381 surface treatment Methods 0.000 title claims abstract description 11
- 239000002002 slurry Substances 0.000 claims abstract description 51
- 239000004408 titanium dioxide Substances 0.000 claims abstract description 46
- VSCWAEJMTAWNJL-UHFFFAOYSA-K aluminium trichloride Chemical compound Cl[Al](Cl)Cl VSCWAEJMTAWNJL-UHFFFAOYSA-K 0.000 claims abstract description 26
- 239000000047 product Substances 0.000 claims abstract description 17
- GCLGEJMYGQKIIW-UHFFFAOYSA-H sodium hexametaphosphate Chemical compound [Na]OP1(=O)OP(=O)(O[Na])OP(=O)(O[Na])OP(=O)(O[Na])OP(=O)(O[Na])OP(=O)(O[Na])O1 GCLGEJMYGQKIIW-UHFFFAOYSA-H 0.000 claims abstract description 16
- 235000019982 sodium hexametaphosphate Nutrition 0.000 claims abstract description 16
- 239000001577 tetrasodium phosphonato phosphate Substances 0.000 claims abstract description 16
- DGAQECJNVWCQMB-PUAWFVPOSA-M Ilexoside XXIX Chemical compound C[C@@H]1CC[C@@]2(CC[C@@]3(C(=CC[C@H]4[C@]3(CC[C@@H]5[C@@]4(CC[C@@H](C5(C)C)OS(=O)(=O)[O-])C)C)[C@@H]2[C@]1(C)O)C)C(=O)O[C@H]6[C@@H]([C@H]([C@@H]([C@H](O6)CO)O)O)O.[Na+] DGAQECJNVWCQMB-PUAWFVPOSA-M 0.000 claims abstract description 13
- 239000002270 dispersing agent Substances 0.000 claims abstract description 13
- 238000004537 pulping Methods 0.000 claims abstract description 13
- 239000011734 sodium Substances 0.000 claims abstract description 13
- 229910052708 sodium Inorganic materials 0.000 claims abstract description 13
- 238000005406 washing Methods 0.000 claims abstract description 12
- 239000012065 filter cake Substances 0.000 claims abstract description 9
- 239000003795 chemical substances by application Substances 0.000 claims abstract description 8
- 238000010902 jet-milling Methods 0.000 claims abstract description 8
- 229910019142 PO4 Inorganic materials 0.000 claims abstract description 7
- 150000001875 compounds Chemical class 0.000 claims abstract description 7
- NBIIXXVUZAFLBC-UHFFFAOYSA-K phosphate Chemical compound [O-]P([O-])([O-])=O NBIIXXVUZAFLBC-UHFFFAOYSA-K 0.000 claims abstract description 7
- 239000010452 phosphate Substances 0.000 claims abstract description 7
- QXJQHYBHAIHNGG-UHFFFAOYSA-N trimethylolethane Chemical compound OCC(C)(CO)CO QXJQHYBHAIHNGG-UHFFFAOYSA-N 0.000 claims abstract description 6
- ZJCCRDAZUWHFQH-UHFFFAOYSA-N Trimethylolpropane Chemical compound CCC(CO)(CO)CO ZJCCRDAZUWHFQH-UHFFFAOYSA-N 0.000 claims abstract description 5
- 239000008367 deionised water Substances 0.000 claims abstract description 4
- 229910021641 deionized water Inorganic materials 0.000 claims abstract description 4
- 150000003839 salts Chemical class 0.000 claims abstract description 4
- 238000003756 stirring Methods 0.000 claims description 28
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 claims description 18
- 239000004115 Sodium Silicate Substances 0.000 claims description 9
- NTHWMYGWWRZVTN-UHFFFAOYSA-N sodium silicate Chemical compound [Na+].[Na+].[O-][Si]([O-])=O NTHWMYGWWRZVTN-UHFFFAOYSA-N 0.000 claims description 9
- 229910052911 sodium silicate Inorganic materials 0.000 claims description 9
- OGIDPMRJRNCKJF-UHFFFAOYSA-N titanium oxide Inorganic materials [Ti]=O OGIDPMRJRNCKJF-UHFFFAOYSA-N 0.000 claims description 9
- 239000007787 solid Substances 0.000 claims description 7
- 235000011121 sodium hydroxide Nutrition 0.000 claims description 6
- 229910018072 Al 2 O 3 Inorganic materials 0.000 claims description 3
- 125000002467 phosphate group Chemical group [H]OP(=O)(O[H])O[*] 0.000 claims description 3
- 238000010009 beating Methods 0.000 claims description 2
- 238000004519 manufacturing process Methods 0.000 abstract description 2
- NBIIXXVUZAFLBC-UHFFFAOYSA-N Phosphoric acid Chemical compound OP(O)(O)=O NBIIXXVUZAFLBC-UHFFFAOYSA-N 0.000 description 14
- 238000000576 coating method Methods 0.000 description 9
- QAOWNCQODCNURD-UHFFFAOYSA-N Sulfuric acid Chemical compound OS(O)(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-N 0.000 description 8
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 description 7
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 7
- 229910052782 aluminium Inorganic materials 0.000 description 7
- 229910000147 aluminium phosphate Inorganic materials 0.000 description 7
- 229910052710 silicon Inorganic materials 0.000 description 7
- 239000010703 silicon Substances 0.000 description 7
- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 description 6
- 239000011248 coating agent Substances 0.000 description 6
- 229910052698 phosphorus Inorganic materials 0.000 description 6
- 239000011574 phosphorus Substances 0.000 description 6
- 238000012986 modification Methods 0.000 description 5
- 230000004048 modification Effects 0.000 description 5
- 239000003513 alkali Substances 0.000 description 4
- ILRRQNADMUWWFW-UHFFFAOYSA-K aluminium phosphate Chemical compound O1[Al]2OP1(=O)O2 ILRRQNADMUWWFW-UHFFFAOYSA-K 0.000 description 4
- 239000010410 layer Substances 0.000 description 4
- TWNQGVIAIRXVLR-UHFFFAOYSA-N oxo(oxoalumanyloxy)alumane Chemical compound O=[Al]O[Al]=O TWNQGVIAIRXVLR-UHFFFAOYSA-N 0.000 description 4
- BNIILDVGGAEEIG-UHFFFAOYSA-L disodium hydrogen phosphate Chemical compound [Na+].[Na+].OP([O-])([O-])=O BNIILDVGGAEEIG-UHFFFAOYSA-L 0.000 description 3
- 229910000397 disodium phosphate Inorganic materials 0.000 description 3
- 235000019800 disodium phosphate Nutrition 0.000 description 3
- 238000002360 preparation method Methods 0.000 description 3
- 238000006467 substitution reaction Methods 0.000 description 3
- 230000000694 effects Effects 0.000 description 2
- 238000000635 electron micrograph Methods 0.000 description 2
- 230000007613 environmental effect Effects 0.000 description 2
- 230000007062 hydrolysis Effects 0.000 description 2
- 238000006460 hydrolysis reaction Methods 0.000 description 2
- 230000002378 acidificating effect Effects 0.000 description 1
- 239000011247 coating layer Substances 0.000 description 1
- 230000000052 comparative effect Effects 0.000 description 1
- 230000002860 competitive effect Effects 0.000 description 1
- 239000002537 cosmetic Substances 0.000 description 1
- 239000013078 crystal Substances 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 239000006185 dispersion Substances 0.000 description 1
- 238000002156 mixing Methods 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 239000004033 plastic Substances 0.000 description 1
- 239000000843 powder Substances 0.000 description 1
- 238000001556 precipitation Methods 0.000 description 1
- 239000002904 solvent Substances 0.000 description 1
- -1 titanium phosphoaluminum Chemical compound 0.000 description 1
- 239000001038 titanium pigment Substances 0.000 description 1
- 239000012463 white pigment Substances 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09C—TREATMENT OF INORGANIC MATERIALS, OTHER THAN FIBROUS FILLERS, TO ENHANCE THEIR PIGMENTING OR FILLING PROPERTIES ; PREPARATION OF CARBON BLACK ; PREPARATION OF INORGANIC MATERIALS WHICH ARE NO SINGLE CHEMICAL COMPOUNDS AND WHICH ARE MAINLY USED AS PIGMENTS OR FILLERS
- C09C1/00—Treatment of specific inorganic materials other than fibrous fillers; Preparation of carbon black
- C09C1/36—Compounds of titanium
- C09C1/3692—Combinations of treatments provided for in groups C09C1/3615 - C09C1/3684
-
- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09C—TREATMENT OF INORGANIC MATERIALS, OTHER THAN FIBROUS FILLERS, TO ENHANCE THEIR PIGMENTING OR FILLING PROPERTIES ; PREPARATION OF CARBON BLACK ; PREPARATION OF INORGANIC MATERIALS WHICH ARE NO SINGLE CHEMICAL COMPOUNDS AND WHICH ARE MAINLY USED AS PIGMENTS OR FILLERS
- C09C1/00—Treatment of specific inorganic materials other than fibrous fillers; Preparation of carbon black
- C09C1/36—Compounds of titanium
- C09C1/3607—Titanium dioxide
- C09C1/3653—Treatment with inorganic compounds
-
- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09C—TREATMENT OF INORGANIC MATERIALS, OTHER THAN FIBROUS FILLERS, TO ENHANCE THEIR PIGMENTING OR FILLING PROPERTIES ; PREPARATION OF CARBON BLACK ; PREPARATION OF INORGANIC MATERIALS WHICH ARE NO SINGLE CHEMICAL COMPOUNDS AND WHICH ARE MAINLY USED AS PIGMENTS OR FILLERS
- C09C1/00—Treatment of specific inorganic materials other than fibrous fillers; Preparation of carbon black
- C09C1/36—Compounds of titanium
- C09C1/3607—Titanium dioxide
- C09C1/3653—Treatment with inorganic compounds
- C09C1/3661—Coating
-
- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09C—TREATMENT OF INORGANIC MATERIALS, OTHER THAN FIBROUS FILLERS, TO ENHANCE THEIR PIGMENTING OR FILLING PROPERTIES ; PREPARATION OF CARBON BLACK ; PREPARATION OF INORGANIC MATERIALS WHICH ARE NO SINGLE CHEMICAL COMPOUNDS AND WHICH ARE MAINLY USED AS PIGMENTS OR FILLERS
- C09C1/00—Treatment of specific inorganic materials other than fibrous fillers; Preparation of carbon black
- C09C1/36—Compounds of titanium
- C09C1/3607—Titanium dioxide
- C09C1/3669—Treatment with low-molecular organic compounds
-
- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09C—TREATMENT OF INORGANIC MATERIALS, OTHER THAN FIBROUS FILLERS, TO ENHANCE THEIR PIGMENTING OR FILLING PROPERTIES ; PREPARATION OF CARBON BLACK ; PREPARATION OF INORGANIC MATERIALS WHICH ARE NO SINGLE CHEMICAL COMPOUNDS AND WHICH ARE MAINLY USED AS PIGMENTS OR FILLERS
- C09C3/00—Treatment in general of inorganic materials, other than fibrous fillers, to enhance their pigmenting or filling properties
- C09C3/006—Combinations of treatments provided for in groups C09C3/04 - C09C3/12
-
- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09C—TREATMENT OF INORGANIC MATERIALS, OTHER THAN FIBROUS FILLERS, TO ENHANCE THEIR PIGMENTING OR FILLING PROPERTIES ; PREPARATION OF CARBON BLACK ; PREPARATION OF INORGANIC MATERIALS WHICH ARE NO SINGLE CHEMICAL COMPOUNDS AND WHICH ARE MAINLY USED AS PIGMENTS OR FILLERS
- C09C3/00—Treatment in general of inorganic materials, other than fibrous fillers, to enhance their pigmenting or filling properties
- C09C3/06—Treatment with inorganic compounds
-
- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09C—TREATMENT OF INORGANIC MATERIALS, OTHER THAN FIBROUS FILLERS, TO ENHANCE THEIR PIGMENTING OR FILLING PROPERTIES ; PREPARATION OF CARBON BLACK ; PREPARATION OF INORGANIC MATERIALS WHICH ARE NO SINGLE CHEMICAL COMPOUNDS AND WHICH ARE MAINLY USED AS PIGMENTS OR FILLERS
- C09C3/00—Treatment in general of inorganic materials, other than fibrous fillers, to enhance their pigmenting or filling properties
- C09C3/06—Treatment with inorganic compounds
- C09C3/063—Coating
-
- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09C—TREATMENT OF INORGANIC MATERIALS, OTHER THAN FIBROUS FILLERS, TO ENHANCE THEIR PIGMENTING OR FILLING PROPERTIES ; PREPARATION OF CARBON BLACK ; PREPARATION OF INORGANIC MATERIALS WHICH ARE NO SINGLE CHEMICAL COMPOUNDS AND WHICH ARE MAINLY USED AS PIGMENTS OR FILLERS
- C09C3/00—Treatment in general of inorganic materials, other than fibrous fillers, to enhance their pigmenting or filling properties
- C09C3/08—Treatment with low-molecular-weight non-polymer organic compounds
-
- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01P—INDEXING SCHEME RELATING TO STRUCTURAL AND PHYSICAL ASPECTS OF SOLID INORGANIC COMPOUNDS
- C01P2002/00—Crystal-structural characteristics
- C01P2002/01—Crystal-structural characteristics depicted by a TEM-image
Landscapes
- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Pigments, Carbon Blacks, Or Wood Stains (AREA)
- Paints Or Removers (AREA)
Abstract
The invention belongs to the field of titanium dioxide production, and provides a surface treatment method of water-based paint titanium white, which comprises the following steps: s1, adding a dispersing agent into titanium dioxide slurry for pulping and dispersing, wherein the pH is controlled within the range of 9.5-10.5; s2, adding sodium hexametaphosphate into the slurry obtained in the step S1, and pulping and dispersing again; s3, adding a phosphate-containing compound into the slurry obtained in the step S2, and then adjusting the pH of the slurry to 6.5-7.5; s4, adding aluminum chloride and sodium metaaluminate into the slurry obtained in the step S3, curing for 60min, and then adjusting the pH of the slurry to 7.5-8.2; and S5, washing a titanium white filter cake with deionized water, washing out soluble salts, adding an organic treating agent of trimethylolethane or trimethylolpropane, and finally carrying out jet milling to obtain the water-based paint titanium dioxide product. The method endows the titanium dioxide with excellent dispersibility, hiding power and whiteness in the water-based paint.
Description
Technical Field
The invention belongs to the field of titanium dioxide production, and particularly relates to a surface treatment method of water-based paint titanium white.
Background
Titanium dioxide is taken as a white pigment, is widely applied to the fields of paint, plastic, papermaking, printing ink, cosmetics, rubber and the like, and as the application field of the titanium dioxide is continuously expanded, such as indoor and outdoor building coatings, high-end furniture paint and the like, the requirements on the covering power and whiteness of the titanium dioxide are higher and higher; along with the continuous promotion of consumer environmental protection consciousness, the environment-friendly paint is harmless to human bodies, does not pollute the environment, saves VOC emission limit standards all over the country, encourages the use of non-solvent paint, and brings opportunities for the development of environmental protection paint such as water paint. Although the traditional paint still occupies a large market share, the water paint is a green industry and is a direction of future development of paint.
Therefore, the existing surface treatment method of the water-based paint titanium white needs to be optimized.
Disclosure of Invention
In order to solve the prior art, the invention adopts an inorganic coating thought of silicon, phosphorus and aluminum on the surface of titanium dioxide, and provides a surface treatment method for water-based paint titanium dioxide, which adopts aluminum chloride and sodium metaaluminate to jointly provide aluminum oxide in the coating of aluminum.
In order to solve at least one of the technical problems, the invention adopts the following technical scheme:
according to the invention, a surface treatment method of water-based paint titanium white is provided, which comprises the following steps: s1, adding a dispersing agent into titanium dioxide slurry for pulping and dispersing, wherein the pH is controlled within the range of 9.5-10.5; s2, adding sodium hexametaphosphate into the slurry obtained in the step S1, pulping and dispersing again, and stirring uniformly; s3, adding a phosphate-containing compound into the slurry obtained in the step S2, uniformly stirring, then adjusting the pH of the slurry to 6.5-7.5, and uniformly stirring; s4, adding aluminum chloride and sodium metaaluminate into the slurry obtained in the step S3, curing for 60min, adjusting the pH of the slurry to 7.5-8.2, and uniformly stirring; and S5, washing a titanium white filter cake with deionized water, washing out soluble salts, adding an organic treating agent of trimethylolethane or trimethylolpropane, and finally carrying out jet milling to obtain the water-based paint titanium dioxide product.
According to one embodiment of the invention, in step S1, the dispersant comprises sodium silicate and caustic soda flakes.
According to one embodiment of the invention, in step S1, the dispersant is added to the solution of titanium dioxide in a proportion of 1% -2% of the titanium dioxide solids content.
According to one embodiment of the invention, in step S1, the beating concentration is controlled between 220g/L and 450g/L.
In step S1, the slurry viscosity is controlled to be less than 50mpas according to one embodiment of the present invention.
According to one embodiment of the invention, in step S1, the temperature is controlled between 55-65 ℃.
According to one embodiment of the invention, in the step S2, the concentration of sodium hexametaphosphate is 100g/L, and the addition amount of sodium hexametaphosphate is TiO in the titanium dioxide slurry 2 0.1% -0.2% of dry basis weight.
According to one embodiment of the present invention, in step S3, the phosphate group-containing compound is added in an amount of P 2 O 5 Calculated as TiO in the titanium dioxide slurry 2 1% -5% of dry basis.
According to one embodiment of the invention, in step S4, aluminum chloride+sodium metaaluminate is added in an amount of Al 2 O 3 Calculated as TiO in the titanium dioxide slurry 2 2% -5% of dry basis.
According to one embodiment of the invention, in step S5, the filter press is used to wash the titanium white filter cake to a resistivity greater than 80 ohm-meter.
By adopting the technical scheme, compared with the prior art, the invention has at least one of the following advantages:
1. under the condition of high dispersion, inorganic coating of silicon, phosphorus and aluminum is carried out on the surface of titanium white, so that the aim of improving the excellent application performance of the titanium white in the water-based paint is fulfilled;
2. the indexes of whiteness, hiding power, dispersibility and the like of the sample in the water-based paint system are close to the application indexes of similar foreign coated products;
3. the application performance of the titanium white product processed by adopting the silicon, phosphorus and aluminum coating process in the water paint is close to and reaches the foreign water paint, and the quality of the titanium white product is competitive;
4. by coating a uniform and compact silicon film layer on the surface of titanium dioxide particles, the photochemical activity of the titanium dioxide surface is primarily reduced, and the binding force of aluminum phosphate and the titanium dioxide surface is increased; then, compact aluminum phosphate is processed, and an amorphous aluminum oxide film layer is formed on the outer layer of the titanium white powder by utilizing the compactness of amorphous aluminum oxide under the condition that the compactness of the aluminum phosphate film layer is not damaged; the titanium white inorganic surface treatment process endows the titanium white with excellent dispersibility, covering power and whiteness in the water-based paint.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings that are required in the embodiments or the description of the prior art will be briefly described, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
FIG. 1 shows a process flow diagram of a method for surface treatment of aqueous coated titanium white according to the invention;
fig. 2 shows a TEM electron micrograph of the titanium phosphoaluminum coated sample obtained in example 1.
Detailed Description
The present invention will be described in further detail with reference to the following examples in order to make the objects, technical solutions and advantages of the present invention more apparent. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the scope of the invention.
It should be understood that the embodiments of the invention shown in the exemplary embodiments are only illustrative. Although only a few embodiments have been described in detail in this disclosure, those skilled in the art will readily appreciate that many modifications are possible without materially departing from the teachings of the subject matter of this disclosure. Accordingly, all such modifications are intended to be included within the scope of present invention. Other substitutions, modifications, changes and omissions may be made in the design, operating conditions and parameters of the exemplary embodiments without departing from the spirit of the present inventions.
Fig. 1 shows a surface treatment method of aqueous coating titanium white according to the invention, generally comprising the steps of:
s1, adding a dispersing agent into titanium dioxide slurry to carry out pulping and dispersing, wherein the PH is controlled within the range of 9.5-10.5;
s2, adding sodium hexametaphosphate into the slurry obtained in the step S1, pulping and dispersing again, and stirring uniformly;
s3, adding a phosphate-containing compound into the slurry obtained in the step S2, uniformly stirring, then adjusting the pH of the slurry to 6.5-7.5, and uniformly stirring;
s4, adding aluminum chloride and sodium metaaluminate into the slurry obtained in the step S3, curing for 60min, adjusting the pH of the slurry to 7.5-8.2, and uniformly stirring; and
s5, washing a titanium white filter cake with deionized water, washing out soluble salts, adding an organic treating agent of trimethylolethane or trimethylolpropane, and finally carrying out jet milling to obtain the water-based paint titanium white product.
In an embodiment of the present invention, in step S1, the dispersant may include sodium silicate and caustic soda flakes. Specifically, dispersing agent is added into the solution of titanium dioxide according to the proportion of 1% -2% of the titanium dioxide solid content, the pulping concentration is controlled to be 220g/L-450g/L, the slurry viscosity is controlled to be less than 50mpas, and the temperature is controlled to be 55-65 ℃.
In the step S2, the addition amount of the sodium hexametaphosphate with the concentration of 100g/L is TiO in the titanium dioxide slurry 2 Dry basis weight0.1% -0.2% of the amount. For example: the volume of sodium hexametaphosphate required to be added in the slurry containing 20 tons of titanium dioxide is as follows: 20 tons 0.1% ×1000=20 kg; 20 kg/100 g/l=0.2m 3 Namely, sodium hexametaphosphate with solid content of 100g/L is added to 0.2m 3 . After the sodium hexametaphosphate is added, the viscosity of the titanium white slurry of the solution can be further reduced, the fluidity of the solution is increased, and the dispersing effect of sodium silicate in the titanium white slurry is improved.
In step S3, the amount of the phosphate group-containing compound to be added is P 2 O 5 Preferably TiO in the titanium dioxide slurry 2 1% -5% of dry basis. In step S4, aluminum chloride is hydrolyzed to be acidic, sodium metaaluminate is hydrolyzed to be alkaline, hydrolysis is promoted mutually, and the double hydrolysis product comprises Al containing crystal water 2 O 3 The addition amount of aluminum chloride and sodium metaaluminate is Al 2 O 3 Preferably TiO in the titanium dioxide slurry 2 2% -5% of dry basis. In the step S5, washing the titanium white filter cake until the resistivity of the titanium white filter cake is more than 80 ohm-meter, adding an organic treating agent, and carrying out jet milling to obtain a product. In both step S3 and step S4, 10% -15% dilute sulfuric acid or dilute alkali can be used to adjust the pH value of the slurry to a desired value.
According to the method, 1.0% -2.0% sodium silicate is directly added in the process of dispersing and pulping titanium pigment slurry to form uniform slurry; after the uniform mixing of sodium silicate is ensured, sodium hexametaphosphate is added for redispersion, phosphoric acid is added, aluminum chloride and sodium metaaluminate are finally co-flowed, and the full precipitation of aluminum phosphate and aluminum oxide on the surface of titanium dioxide is ensured for inorganic coating.
The following description is made with reference to specific examples.
Example 1:
in this embodiment, the preparation method of the titanium dioxide sample includes the following steps:
s1, adding a dispersing agent compounded by sodium silicate and sodium hydroxide solution into a titanium dioxide solution according to the proportion of 1% of titanium dioxide solid content, controlling the pulping concentration of the titanium dioxide to 220g/L, controlling the pH to 9.5, controlling the viscosity of slurry to be less than 50mpas, controlling the temperature to 60 ℃, and stirring for 30min;
s2, adding 0.1% of sodium hexametaphosphate, and stirring for 30min;
s3, 1% phosphate was added, and phosphoric acid (wherein P 2 O 5 Can be provided by sodium hydrogen phosphate, phosphoric acid and the like), stirring for 120min, adding 10-15% of dilute sulfuric acid or dilute alkali to adjust the pH of the slurry to 6.5, and stirring for 30min;
s4, adding 1.5% of aluminum chloride and 1.6% of sodium metaaluminate, curing for 60min, adjusting the pH of the slurry to 7.5, and stirring for 120min;
s5, washing the titanium white filter cake until the resistivity is more than 80 ohm-meter, adding the organic treating agent trimethylolethane, and carrying out jet milling to obtain the product.
Example 2
In this embodiment, the preparation method of the titanium dioxide sample includes the following steps:
s1, adding a dispersing agent compounded by sodium silicate and sodium hydroxide solution into a titanium dioxide solution according to the proportion of 1.5% of titanium dioxide solid content, controlling the pulping concentration of the titanium dioxide to 450g/L, controlling the pH to 10.5, controlling the slurry viscosity to be less than 50mpas, controlling the temperature to be 55 ℃, and stirring for 30min;
s2, adding 0.2% of sodium hexametaphosphate, and stirring for 30min;
s3, 5% phosphate was added in this example using phosphoric acid (wherein P 2 O 5 Can be provided by sodium hydrogen phosphate, phosphoric acid and the like), stirring for 120min, adding 10-15% of dilute sulfuric acid or dilute alkali to adjust the pH of the slurry to 7, and stirring for 30min;
s4, adding 2% of aluminum chloride and 2.3% of sodium metaaluminate, curing for 60min, adjusting the pH of the slurry to 7.5, and stirring for 120min;
s5, washing until the resistivity is more than 80 ohm-meter, adding the organic treating agent trimethylolethane, and carrying out jet milling to obtain the product.
Example 3
In this embodiment, the preparation method of the titanium dioxide sample includes the following steps:
s1, adding a dispersing agent compounded by sodium silicate and sodium hydroxide solution into a titanium dioxide solution according to the proportion of 2% of titanium dioxide solid content, controlling the pulping concentration of the titanium dioxide to 450g/L, controlling the pH to 10.5, controlling the viscosity of slurry to be less than 50mpas, controlling the temperature to 65 ℃, and stirring for 30min;
s2, adding 0.2% of sodium hexametaphosphate, and stirring for 30min;
s3, 5% phosphate was added in this example using phosphoric acid (wherein P 2 O 5 Can be provided by sodium hydrogen phosphate, phosphoric acid and the like), stirring for 120min, adding 10-15% of dilute sulfuric acid or dilute alkali to adjust the pH of the slurry to 7.5, and stirring for 30min;
s4, adding 2% of aluminum chloride and 2.3% of sodium metaaluminate, curing for 60min, adjusting the pH of the slurry to 8.2, and stirring for 120min;
s5, washing until the resistivity is more than 80 ohm-meter, adding an organic treating agent of trimethylolpropane, and carrying out jet milling to obtain the product.
The quality of the samples prepared in the examples 1-3 is compared with that of a special titanium white product for foreign water paint, and the formula of the water paint is shown in the table 1:
table 1: general formula of water paint
The water paint with the formula is stirred for 40min in high stirring of 1200r/min to prepare the water paint.
The water dispersibility of the paint sample was measured on a blade fineness gauge, and the Hunter whiteness and hiding power were measured on a CM-5 color difference meter for a standard paint plate made of the paint sample. The comparative results of the samples prepared in examples 1 to 3 and the foreign water paint are shown in Table 2:
table 2: examples 1-3 comparison of the application Properties of coated samples and foreign Standard samples in Water paint systems
From the data in Table II, it can be seen that the indexes of the samples of examples 1, 2 and 3, such as whiteness, hiding power, dispersibility and the like, in the water-based paint system are close to the application indexes of special titanium white products of the similar water-based paints abroad. In which fig. 2 shows a TEM electron micrograph of a silicon, phosphorus, aluminum coated sample obtained in example 1. And the product coated with silicon, phosphorus and aluminum is observed through an electron microscope, and the coating layer is very compact.
The application performance of the titanium white product processed by adopting the silicon, phosphorus and aluminum coating process disclosed by the invention in the water-based paint is close to and reaches the quality of the foreign water-based paint competing titanium white product. The foregoing description is only of the preferred embodiments of the present invention and is not intended to limit the scope of the invention; modifications and equivalent substitutions are intended to be included in the scope of the claims without departing from the spirit and scope of the present invention.
Those of ordinary skill in the art will appreciate that: the above discussion of any embodiment is merely exemplary and is not intended to imply that the scope of the disclosure of embodiments of the invention, including the claims, is limited to such examples; combinations of features of the above embodiments or in different embodiments are also possible within the idea of an embodiment of the invention, and there are many other variations of the different aspects of the embodiments of the invention as described above, which are not provided in detail for the sake of brevity. Therefore, any omissions, modifications, equivalent substitutions, improvements, and the like, which are made within the spirit and principles of the embodiments of the invention, are included within the scope of the embodiments of the invention.
Claims (10)
1. The surface treatment method of the water-based paint titanium white is characterized by comprising the following steps of:
s1, adding a dispersing agent into titanium dioxide slurry for pulping and dispersing, wherein the pH is controlled within the range of 9.5-10.5;
s2, adding sodium hexametaphosphate into the slurry obtained in the step S1, pulping and dispersing again, and stirring uniformly;
s3, adding a phosphate-containing compound into the slurry obtained in the step S2, uniformly stirring, then adjusting the pH of the slurry to 6.5-7.5, and uniformly stirring;
s4, adding aluminum chloride and sodium metaaluminate into the slurry obtained in the step S3, curing for 60min, adjusting the pH of the slurry to 7.5-8.2, and uniformly stirring; and
s5, washing a titanium white filter cake with deionized water, washing out soluble salts, adding an organic treating agent of trimethylolethane or trimethylolpropane, and finally carrying out jet milling to obtain the water-based paint titanium white product.
2. The method of claim 1, wherein in step S1, the dispersant comprises sodium silicate and caustic soda flakes.
3. The method according to claim 2, wherein in step S1, the dispersant is added to the solution of titanium dioxide in a proportion of 1% -2% of titanium dioxide solids.
4. The method according to claim 2, wherein in step S1, the beating concentration is controlled to be 220g/L to 450g/L.
5. The method according to claim 2, wherein in step S1, the slurry viscosity is controlled to be less than 50mpas.
6. The method according to claim 2, wherein in step S1, the temperature is controlled between 55 and 65 ℃.
7. The method according to claim 1, wherein in step S2, the concentration of sodium hexametaphosphate is 100g/L and the addition amount of sodium hexametaphosphate is the amount of TiO in the titanium dioxide slurry 2 0.1% -0.2% of dry basis weight.
8. The method according to claim 1, wherein in step S3, the phosphate group-containing compound is added in an amount of P 2 O 5 Calculated as TiO in the titanium dioxide slurry 2 1% on dry basis-5％。
9. The method according to claim 1, wherein in step S4, aluminum chloride+sodium metaaluminate is added in an amount of Al 2 O 3 Calculated as TiO in the titanium dioxide slurry 2 2% -5% of dry basis.
10. The method according to claim 1, wherein in step S5, the titanium white filter cake is washed with a filter press to a specific resistance of more than 80 ohm-meter.
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